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VBA - ADVANCED VIDEOS
- Flappy Owl in Excel VBA
- Excel VBA Part 15.2 - Find and FindNext
- Excel VBA Part 20a - Application Events
- Excel VBA Part 25 - Arrays
- Excel VBA Part 26 - Constants and Enumerations
- Excel VBA Part 33 - Creating Add Ins
- Excel VBA - Disable Screen Updates
- Excel VBA Part 43.1 - ByRef and ByVal
- Excel VBA Part 43.2 - ByRef and ByVal (When to use Parentheses)
- Excel VBA Part 44 - Making Excel Talk
- Excel VBA Part 45 - Finding the Last Used Row, Column and Cell
VBA - advanced videos | Excel VBA Part 20a - Application Events
Posted by Andrew Gould on 26 November 2015
In an earlier video in the series we've seen how to write event-handlers for workbooks and worksheets; this video teaches you how to access events of the Excel application itself! You'll learn the significance of the WithEvents keyword, a couple of the basic application events such as the new workbook event, and how to use a basic class module to keep your application event handlers neatly organised.
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The following is code form your video:
' ThisWorkbook
Option Explicit
Private xlApp As EventApp
Private Sub Workbook_Open()
Set xlApp = New EventApp
End Sub
' Class Module called EventApp
Option Explicit
Private WithEvents xlApp As Application
Private Sub Class_Initialize()
Set xlApp = Application
End Sub
Private Sub xlApp_NewWorkbook(ByVal Wb As Workbook)
Wb.Worksheets("Sheet1").Range("A1").Value = "Created on " & Date
Wb.Worksheets("Sheet1").Range("A2").Value = "Created by " & Environ("UserName")
End Sub
I have seen this from a book:
' Class Module called EventApp
Public WithEvents xlApp As Application
Private Sub xlApp_NewWorkbook(ByVal Wb As Workbook)
Wb.Worksheets("Sheet1").Range("A1").Value = "Created on " & Date
Wb.Worksheets("Sheet1").Range("A2").Value = "Created by " & Environ("UserName")
End Sub
' Standard Module
Public myAppEvent As New EventApp
Sub TrapAppEvent()
Set myAppEvent.xlApp = Application
End Sub
Both versions work but there are some differences.
1. Your variables are declared Private whereas the other version is declared Public, eg Private xlApp As EventApp / Private WithEvents xlApp As Application
The other version declares: Public WithEvents xlApp As Application / Public myAppEvent As New EventApp
2. The other version contains this line:
Set myAppEvent.xlApp = Application
but yours doesn't.
Can you please explain the significance of these two points.
Thanks
Hi there,
1. Variables declared as Private are accessible only within the module in which they are declared. Variables declared as Public can be referenced from any module in the same project. I declared xlApp as Private in both the class and normal modules so that the variable was specific to each module.
2. The same line appears in my code in the Initialize event of the class module - the Initialize event is triggered when a new instance of the class is created.
I hope that helps!